Professional Email Signatures: 5 Templates, 12 Best Practices and the Real Size Limits

A professional email signature needs four things: your full name, your job title, your company, and one reliable way to reach you besides email. Everything else is optional. Gmail caps a signature at 10,000 characters, and Google states that any image you add counts toward that same limit.

The frame for this one: the rubber stamp. You cut it once, then press it onto every letter you send for the next three years.

Which is why a small mistake in a signature is expensive. A wrong phone number in a paragraph reaches one person, and a wrong phone number in a stamp reaches everyone.

What Are the Four Must-Have Elements of a Professional Email Signature?

Name, title, company, and one alternate contact method. That’s the whole required set, and everything past it is a judgment call.

Your full name. Use the name you’d want a stranger to search for, and use it consistently across every account.

Your job title. Titles tell the recipient how much weight your reply carries, which matters most when introducing yourself to someone new.

Your company name. Include it even when your address already contains it, because plenty of recipients read on a phone that hides the address.

One alternate contact method. A phone number, a booking link, or a LinkedIn profile. One is enough.

What Optional Elements Should You Consider Adding?

Add these only when they earn their space, because the stamp gets pressed on every message.

• Social links. Worth it for social sellers and for anyone whose profile is part of the pitch, and dead weight for everyone else.
• A call to action. A booking link or a demo link converts far better than a generic website link. Our list of CTA examples covers the phrasing.
• A pronoun line. Cheap, useful, and increasingly expected in corporate settings.
• A logo or headshot. Read the image section below before you add one, because Google publishes rules here that almost nobody follows.
• A legal disclaimer. Required in some industries and useless in most. See the compliance section.
• A quote. Quotes can be fun, and they’re the first thing to cut when the signature gets long.

Four Things Most Email Signature Advice Gets Wrong

I checked ten vendor documentation pages across Google, Microsoft and Apple for this rewrite. Four widely repeated claims don’t hold up.

1. Images Count Toward Gmail’s 10,000-Character Limit

Gmail’s 10,000-character cap is real and Google documents it twice. The part that gets left out is what counts as a character.

“Your image also counts toward the character limit. If you get an error, try to resize the image.”

Source: Google’s official guide on changing your Gmail signature

That single line explains an error people hit constantly. A signature with four visible lines of text can fail the limit, because an embedded image is eating thousands of characters.

Resize the image and the error goes away. Google’s admin documentation repeats the same 10,000 figure for Workspace footers.

2. Google Publishes Signature Image Dimensions, and Almost Nobody Cites Them

I expected to find no vendor guidance here. I was wrong, and Google is specific.

“We recommend a signature image that’s 70 to 100 pixels high by 300 to 400 pixels wide. The maximum size for email signature images is 100 pixels high by 1000 pixels wide.”

Source: Google, Troubleshoot issues with Gmail signatures

Google repeats that same recommendation on its Workspace admin footer page. Neither Microsoft nor Apple publishes any image dimensions at all, so this is Google’s guidance rather than an industry standard.

Google adds one more image rule people trip on. A signature image hosted in Google Drive has to be shared publicly, or recipients see nothing.

3. The “Signature Images Are Blocked by Default” Claim Is Half Wrong

This is the correction I’d most like people to take away. The claim is true for Outlook and false for Gmail, and it’s usually stated as if it were universal.

Microsoft’s position: “Microsoft Outlook is configured by default to block automatic picture downloads from the Internet.” Microsoft explains the reason as avoiding tracking pixels.

Google’s position is the opposite: “By default, when you get an email with an image, you’ll see the image automatically.” Google also proxies images, and states that senders “can’t use image loading to get information about your computer or location.”

So an image-heavy signature degrades gracefully in Gmail and breaks in Outlook. Design for the client your recipients use, and always put your contact details in text rather than inside the image.

4. No Vendor Recommends a Signature Length

“Keep it to three or four lines” is the most repeated advice in this category. It comes from nobody official.

I checked ten pages across Google, Microsoft and Apple documentation. Not one states a recommended character count, word count or line count for a signature.

Google recommends image dimensions and publishes a 10,000-character ceiling. That’s the entire body of vendor guidance on signature size, and everything else circulating is opinion presented as a rule.

My own opinion, labeled as one: four to six lines reads well, and past eight it starts looking like a business card someone laminated. But shorter is usually better applies to signatures as much as to the message above them.

5 Email Signature Templates You Can Copy

Copy one, swap the details, and delete any line that doesn’t apply to you. Each is written to stay under Gmail’s limit with room for a small logo.

To build any of these templates without editing code, WiseStamp lets you create and customize a professional email signature in minutes.

Template 1: The Minimal Professional

Jordan Reyes
Senior Account Manager, Northwind Logistics
+1 206 555 0142

Three lines, nothing wasted. This is the safest default and the one I’d pick if you only read this far.

Template 2: The Sales Signature With a CTA

Jordan Reyes
Senior Account Manager, Northwind Logistics
+1 206 555 0142 | LinkedIn
Book 15 minutes: northwind.example.com/jordan

The booking link is the only element here that changes outcomes. Use it when you’re already making a pitch, and drop it from internal mail.

Template 3: The Executive

Jordan Reyes
Chief Operating Officer
Northwind Logistics
northwind.example.com

No phone number, no social links, no CTA. At this level the scarcity is the signal, and an assistant handles routing anyway.

Template 4: The Job Seeker

Jordan Reyes
Supply Chain Analyst
+1 206 555 0142
Portfolio: jordanreyes.example.com | LinkedIn

Lead with the role you want rather than the one you have. The portfolio link is doing the work here.

Template 5: The Support and Service Signature

Jordan Reyes
Customer Support, Northwind Logistics
Hours: Mon to Fri, 8am to 5pm Pacific
Help center: northwind.example.com/help

Publishing your hours cuts follow-up chasers more than any other single line. Teams that add it see fewer “did you get this?” replies, and our case studies cover support teams that tightened reply times without adding headcount.

How Signatures Differ Across Gmail, Outlook and Apple Mail

Every cell here comes from the vendor’s own documentation, checked 4 August 2026.

Capability	Gmail	Outlook	Apple Mail
Documented character limit	Google states 10,000, images included	Microsoft publishes no figure	Apple publishes no figure
Images in a desktop signature	Google supports URL, Drive or upload	Microsoft supports images	Apple says to drag an image into the preview area
Images in a mobile signature	Google documents text entry only	Not documented per client	Apple states you can only use text on iPhone
Mobile signature syncs from desktop	Google says the mobile signature is separate	Roaming signatures cover supported accounts	Apple does not document sync
Per-account signatures	Google supports one per Send mail as address	Microsoft supports one per account	Apple supports per-account signatures
Signature above quoted text on reply	Setting exists, undocumented by Google	Set separately for replies and forwards	Apple documents the checkbox
Contact card attached to a signature	Not documented by Google	Microsoft documents Electronic Business Cards	Not documented by Apple

Your Phone Signature Is a Different Signature

This catches almost everyone, and Google is explicit about it.

The Gmail mobile signature is separate from the one you set on the web. Google’s Android help states you set up a signature “that shows up only for emails you send from the Gmail app.”

Google also documents the fallback: if you don’t create one in the app, new messages use the signature from your computer. So the mobile signature overrides rather than merges.

On iOS, Google adds a second trap. If you have multiple accounts in the Gmail app, you have to change the setting for each one separately.

Apple Mail on iPhone is stricter still, and states the limit in one sentence: “You can only use text in your Mail signatures.” Apple Mail on a Mac does support images, so the same person gets different capabilities on their two Apple devices.

Outlook Roaming Signatures, and Who Doesn’t Get Them

Microsoft solved cross-device signatures with roaming signatures, which store the signature in the mailbox. It needs build 2303 or higher.

The exclusions matter more than the feature. Microsoft states which accounts miss out.

“Accounts hosted on Exchange on-premises servers, with third-party email services, or utilizing POP/IMAP accounts will not be able to roam their signatures.”

There’s a second catch. Only signatures set as default for new messages or for replies and forwards migrate to the cloud. Others stay local, listed under “Signatures on this device,” and can’t be edited there.

12 Email Signature Best Practices

1. Put every contact detail in text, never inside an image. Outlook blocks remote images by default, so an image-only signature shows a recipient nothing.
2. Resize images before uploading. Google states images count toward the 10,000-character limit, which is the usual cause of a “signature too long” error.
3. Stay inside Google’s published image dimensions. Google recommends 70 to 100 pixels high by 300 to 400 wide, with a maximum of 100 by 1000.
4. Set the mobile signature separately. Google documents that the Gmail app signature is its own setting, and that it overrides the desktop one.
5. Set a different signature for replies. A full signature on every message in a twelve-message thread makes the thread unreadable.
6. Use one signature per sending address. Gmail supports a separate signature for each Send mail as address, and Outlook supports one per account.
7. Include a physical postal address on commercial email. The FTC requires it, with no exception for business-to-business messages.
8. Skip the confidentiality boilerplate unless legal asked for it. No vendor documents any requirement for one, and it lengthens every message you send.
9. Link one call to action rather than four. A single booking link outperforms a row of icons, and it survives an image block.
10. Test what it looks like in Outlook. Send yourself a message and view it with images blocked, which is how a large share of recipients will see it.
11. Update it when your title changes, not six months later. The stamp keeps pressing the old title onto every message until you fix it.
12. Keep the same name across accounts. Consistency is what makes you findable, and it costs nothing.

What Does the Law Require in an Email Signature?

For commercial email in the United States, one thing: a valid physical postal address.

The FTC’s CAN-SPAM compliance guide is direct about it, under a heading that reads “Tell recipients where you’re located.”

“Your message must include your valid physical postal address. This can be your current street address, a post office box you’ve registered with the U.S. Postal Service, or a private mailbox you’ve registered with a commercial mail receiving agency established under Postal Service regulations.”

Source: FTC, CAN-SPAM Act Compliance Guide for Business

Two details people get wrong. The FTC states that the law “makes no exception for business-to-business email,” and penalties run up to 53,088 usd per message.

No email vendor documents what a legal footer must contain. Google is the only one that even provides a compliance-oriented tool, an admin Append footer setting capped at 10,000 characters that doesn’t support HTML.

How Do You Change Your Email Signature in Gmail?

Open Gmail, click the gear icon, then See all settings. Scroll down the General tab to the Signature section.

Click Create new, name it, then write the signature in the box. Choose defaults below the box for new emails and for replies and forwards, then click Save Changes at the bottom.

If you send from more than one address, a drop-down above the signature box lets you pick which address each signature belongs to. Google documents this under its Send mail as feature.

On mobile it’s a different menu entirely. In the Gmail app, open Settings, choose your account, then Signature settings. There’s how to set up a Gmail mobile signature if you want the platform-by-platform walkthrough.

Managing several at once is easier with a dedicated tool, and there are create multiple email signatures options that handle a whole team’s branding.

Does a Signature Change Anything Measurable?

On its own, barely. What it changes is how easy you are to reach when someone wants to reply through another channel. The signature is the last of three parts in an email ending, and our guide on how to end an email professionally, with 11 closings covers the two that come before it.

EmailAnalytics is a SaaS tool that visualizes team email activity in Gmail and Outlook, focused on how long replies take. Adding office hours to a support signature shows up in a team’s average email response time a month later.

Auditing the rest of your setup too? Our roundup of email productivity tool options covers the signature managers as well.

Start Here: Fixing Your Signature in Ten Minutes

1. Write the four essentials in plain text: name, title, company, and one alternate contact method.
2. If you want a logo, size it to Google’s recommended 70 to 100 pixels high by 300 to 400 wide first.
3. Set a shorter version as your default for replies and forwards, so long threads stay readable.
4. Open the Gmail app and set the mobile signature separately, because Google keeps it apart from the web one.
5. Send yourself a test and view it with images turned off, which is how Outlook recipients will see it.

Frequently Asked Questions About Email Signatures

What should an email signature include?

A professional email signature needs your full name, job title, company name, and one contact method other than email. Everything beyond that is optional and should earn its place, since the signature appears on every message you send. Commercial email in the United States also has to carry a valid physical postal address, per the FTC.

How do you change your email signature in Gmail?

Open Gmail, click the gear icon, choose See all settings, then scroll the General tab to Signature and click Create new. Write the signature, pick your defaults for new emails and replies, then click Save Changes. The mobile signature is a separate setting in the Gmail app, under Settings, your account, then Signature settings.

Should you include social media links in your email signature?

Include them when your profile is part of how you do business, and leave them out otherwise. Sales people, recruiters and anyone doing social selling get real value from a LinkedIn link. Use text links rather than icon images, since Outlook blocks remote images by default and a row of icons can arrive as empty boxes.

Should you include a call to action in your email signature?

One call to action is worth including if it points somewhere specific, such as a booking link or a demo page. A generic link to your homepage adds length without changing behavior. Drop the call to action from internal email, where it reads as a sales reflex.

Should you include images in your email signature?

Only if every contact detail also appears in text, because Microsoft states that Outlook blocks automatic picture downloads by default. Gmail displays images automatically, so one signature can look complete in one client and empty in another. Google recommends signature images of 70 to 100 pixels high by 300 to 400 wide, and counts images toward Gmail’s 10,000-character limit.

How long should an email signature be?

No email vendor publishes a recommended length, so the widely repeated “three to four lines” rule comes from opinion rather than documentation. The only published ceiling is Gmail’s 10,000-character limit, which includes any image you embed. Four to six lines reads well in practice, and past eight the signature starts competing with your message.

Should you use different email signatures for different situations?

Yes, and both Gmail and Outlook support it. Gmail allows a separate signature for each Send mail as address, plus separate defaults for new messages and replies. Outlook assigns signatures per account and per message type, and a shorter reply signature is the most useful version to set up.

Should you include your email address in your email signature?

It’s usually redundant, since the recipient already has your address in the message header. There’s one good reason to include it anyway. Signatures get forwarded, screenshotted and printed, and the header may not travel with them. If space is tight, cut the email address before you cut your phone number.

What We Checked, and When

Every figure and quotation here was verified against Google, Microsoft, Apple and FTC documentation on 4 August 2026. Microsoft’s roaming signatures page carries an ms.date of 04/08/2024, and Google’s help pages print no dates at all.

Three things I looked for and could not find on any vendor page: a signature character limit for Outlook, a documented number of signatures allowed per account, and any recommended signature length. Microsoft’s classic Outlook and web tabs also do not render in a plain fetch, so any claim here about a specific non-new Outlook client should be treated as less certain than the rest.